<?php

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require ('db_conn.php');//包含连接文件
$sqlc="select * from tb_abc LIMIT 0 , 4";
$abcrs=$db->query($sqlc);
$abcrows=$abcrs->fetch_all(MYSQLI_BOTH);
   require 'page_html.php';
   //释放结果集
 //  $result->free();
   //关闭数据库
   $db->close();